Since you cant get reborn anymore I had to switch to arm course media. With Reborn at 6.4 ph it kept my alk at 8.0. Now with arm at 6.4 my alk dropped to 7.6 then 7.4 in two days. I went down to 6.3 and increased the mls to 60 from 55. Going to test again tonight the see what my alk is. I've see some people online running arm as low as 6.2. Just wondering how many people on here are using it and how they like it.